Android Activity Lifecycle Quiz

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Questions and Answers

What is the primary purpose of the onCreate() method in an Android activity?

To restore the state of the activity from savedInstanceState.

To initialize UI components and set up the activity's layout. (correct)

To perform cleanup before the activity is destroyed.

To handle user input events.

How does an Android activity restore its previous state when being recreated?

By using the savedInstanceState parameter. (correct)

By querying the system for the last state.

By calling the onResume() method.

By accessing a static variable holding the previous state.

Which of the following best describes the purpose of the savedInstanceState bundle?

It contains the activity's resource IDs for view inflation.

It provides a method to save data on activity pause.

It stores data to be restored on configuration changes. (correct)

It holds a reference to the application's context.

In which part of the activity lifecycle is it appropriate to initiate UI-related actions?

In the onCreate() method. Signup and view all the answers

What will happen if the mShowCount variable is null when onCreate() is executed?

A NullPointerException will be thrown. Signup and view all the answers

What is the primary purpose of the onCreate() method in an Android Activity?

To perform static setup for the Activity. Signup and view all the answers

What follows the created state in the Activity lifecycle after onCreate() is called?

onStart() Signup and view all the answers

How often is the onCreate() method called during an Activity's lifecycle?

Only once. Signup and view all the answers

What type of parameter does the onCreate() method accept to restore the Activity's state?

Bundle Signup and view all the answers

What aspect of an Activity is primarily managed through callbacks such as onCreate()?

Activity lifecycle. Signup and view all the answers

Which of the following statements about overriding callbacks is true?

It is optional to override callbacks. Signup and view all the answers

What happens if the onCreate() method is not implemented in an Android Activity?

The Activity will crash upon launch. Signup and view all the answers

How does the onCreate() method relate to an Activity's previously frozen state?

It receives a Bundle with the previous state. Signup and view all the answers

What is the primary purpose of the onStart() method in the Android activity lifecycle?

To prepare the activity to become visible to the user Signup and view all the answers

In which scenario will the onStart() method be called multiple times during an activity's lifecycle?

When the user navigates away and returns to the activity Signup and view all the answers

Which of the following statements about the onCreate() method is true?

It is responsible for creating the activity's user interface Signup and view all the answers

What happens if the activity is stopped after onStart() is called?

The onPause() method is called next Signup and view all the answers

How does the onStart() method relate to the activity becoming ready for user interaction?

It prepares the UI elements for user input Signup and view all the answers

How does the Android activity lifecycle handle configuration changes?

By destroying and recreating the activity automatically Signup and view all the answers

What is the expected outcome after onCreate() is completed successfully?

The onStart() method will be called Signup and view all the answers

Which of the following describes correctly what the onStart() method helps to manage in terms of activity state?

It shifts the activity from the hidden state to a visible state Signup and view all the answers

Study Notes

Activity Lifecycle and State

The onCreate() method is called when the Activity is first created, for instance, when a user taps a launcher icon.
onCreate() is responsible for performing static setup tasks, such as creating views, binding data to lists, among others.
onCreate() is only called once during an Activity's lifetime.
onCreate() takes a Bundle object as a parameter to restore the Activity's previously frozen state, if one existed.
The Started state is always followed by the onStart() state.
The onStart() method is called when the Activity is becoming visible to the user.
onStart() can be called more than once during the lifecycle.
If the Activity comes to the foreground, onResume() will be called after onStart().
If the Activity becomes hidden, onStop() will be called after onStart().
To restore an Activity's saved state in onCreate(), use a Bundle object.
Within onCreate(), check if savedInstanceState is not null.
If savedInstanceState is not null, retrieve the saved data using savedInstanceState.getString("count").
Finally, update the UI using mShowCount.setText(count) to display the restored data.

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Description

Test your knowledge on the Android Activity lifecycle and state management. This quiz covers essential methods such as onCreate(), onStart(), and onResume(), exploring their roles in an Activity's lifecycle. Ideal for learners looking to understand the intricacies of Android development.